function xmlhttp() {

	//Create a boolean variable to check for a valid Internet Explorer instance.
	var xmlhttp = false;

	//Check if we are using IE.
	try {
		//If the Javascript version is greater than 5.
		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
		//If not, then use the older active x object.
		try {
			//If we are using MS.
			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (E) {
			//Else we must be using a non-IE browser.
			xmlhttp = false;
		}
	}

	//If we are using a non-IE browser, create a javascript instance of the object.
	if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
		xmlhttp = new XMLHttpRequest();
	}
	return xmlhttp;
}

/*
var xmlhttp;

//If, the activexobject is available, we must be using IE.
if (window.ActiveXObject){
	xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
} else {
	//Else, we can use the native Javascript handler.
	xmlhttp = new XMLHttpRequest();
}
*/

function makerequest(serverPage, objID) {
	
	var xmlhttpreq = xmlhttp();
	var obj = document.getElementById(objID);
	xmlhttpreq.open("GET", serverPage);
	xmlhttpreq.onreadystatechange = function() {
		if (xmlhttpreq.readyState == 4 && xmlhttpreq.status == 200) {
			obj.innerHTML = xmlhttpreq.responseText; // pega el contenido obtenido
		}
	}
	xmlhttpreq.send(null);
}
